<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>留言板</title>
    <style>
        .container {
            width: 350px;
            height: 300px;
            margin: 0 auto;
            /* border: 1px black solid; */
            text-align: center;
        }

        .grey {
            color: grey;
        }

        .container .row {
            width: 350px;
            height: 40px;

            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .container .row input {
            width: 260px;
            height: 30px;
        }

        #submit {
            width: 350px;
            height: 40px;
            background-color: orange;
            color: white;
            border: none;
            margin: 10px;
            border-radius: 5px;
            font-size: 20px;
        }
    </style>
</head>

<body>
    <div class="container">
        <h1>留言板</h1>
        <p class="grey">输入后点击提交, 会将信息显示下方空白处</p>
        <div class="row">
            <span>谁:</span> <input type="text" name="" id="from">
        </div>
        <div class="row">
            <span>对谁:</span> <input type="text" name="" id="to">
        </div>
        <div class="row">
            <span>说什么:</span> <input type="text" name="" id="say">
        </div>
        <input type="button" value="提交" id="submit" onclick="submit()">
        <!-- <div>A 对 B 说: hello</div> -->
    </div>

    <script src="js/jquery.min.js"></script>
    <script>

load();

function load(){
    $.ajax({
        type: "get",
        url: "/message/getList",
        success:function (messages){
            if(messages!=null && messages.length>0){
                var finalHtml = "";
                for (var message of messages){
                    finalHtml+= "<div>"+message.from +"对" + message.to + "说:" +message.message+"</div>";
                }
                $(".container").append(finalHtml);
            }
        }
    });
}

 
        function submit(){
            //1. 获取留言的内容
            var from = $('#from').val();
            var to = $('#to').val();
            var say = $('#say').val();

            if (from== '' || to == '' || say == '') {
                return;
            }
            var data={
                    from:from,
                    to:to,
                    message:say
                }

            $.ajax({
               type:"post",
               url:"message/publish",
                contentType:"application/json",
data:JSON.stringify(data),
               //
               // data: JSON.stringify({
               //    form:from,
               //    to:to,
               //     message:say
               // }),
success:function (result){
                   if(result.ok==1){
                       //成功
                       //2. 构造节点
                       var divE = "<div>"+from +"对" + to + "说:" + say+"</div>";
                       //3. 把节点添加到页面上
                       $(".container").append(divE);

                       //4. 清空输入框的值
                       $('#from').val("");
                       $('#to').val("");
                       $('#say').val("");

                   }else{
//失败
     alert("留言发布失败");
                   }
}
            });



        }
        
    </script>
</body>

</html>